Sanding apparatus



H. A. GAULD SANDINQ APPARATUS Filed Dec. 31, 1951 5 Sheets-Sheet l Aug. 20, 1935. GAULD 2,012,163

SANDING APPARATUS Aug. 20, 1935. H. A. GAULD 2,012,163

SANDING APPARATUS Filed Dec. 31, 1931 s Sheets-Sheet 3 Patented Aug. 20, 1935 3 Claims. (Cl. 51-137) This inventionrelates to abrasive or sanding machines and more particularly to devicesespecially adapted for sanding edges.

It -is an object of my invention to provide a comparatively simple and highly efiicient machine for sanding an edge at any desired angle.

It is afurther object to provide an-edge sanding machine of the class described having com-- paratively few working parts, durable in structure, capableof being manufactured at low cost p d form of integral flanges disposed below the upand adapted to be conveniently and easily controlled and adjusted. 7

These and other objects and advantages of the invention will be more fully set forth in'the. following description made in connection with the accompanying drawings, in which like referer'ice characters. refer to similar parts throughout the several views, and in which:- r

f Fig. lis a front elevation of an embodiment of my machine, some parts of the endless sanding beltand tablebeing broken away; l Fig. 2 is a top plan viewof the same; A Y ,Fig. 3 is a fragmentary rear'elevation of th adjustable belt positioning back;

Fig. 4 is'a vertical cross section'taken on the 1 line '4-4 of Fig.2, looking in the direction indi' cated by the arrows;

Fig. 5 is avertical section taken longitudinallyof' the work-holding table, substantially along the 1ine 5-5'oi.l ig.' 2; .v

Fig. 6 is a detailtcpplan member for positioning the belt;

7 horizontal section showing a means for adjustably mounting the work-supporting table on its 7511011 as a bench I.

mounted on one end of the bench and drives a Fig. "Tis a perspective view showing -the removable board constituting an important part of the adjustable back; Y

Fig. 8 is a fragmentary View mainly taken in base; r I

g. 9 is an elevational view showing one of the a ding belt rollers;

Fig. 10 is a vertical section taken substantially along the line l0l0 of Fig. 9 and showing one of the belt guide rollers, and

Fig ll'i's a detailview showing an end of th work retaining rollers. A I

I In the embodiment of the invention illustrated my machine is mounted on a suitable support An electric motor 2 is large pulley 3 mounted for rotation on a horizontal axis above the level .of the bench. An endless sanding belt 4 is trained about said pulley for driving and is also trained over a second pulley viewof the back 7 (not shown) bench l.-- r I provide a machinebed or'base Sdetachably secured to bench I and disposed inwardly somewhat from the sanding belt '4." Bed; 5 is provided with downturned ends 6 terminating in -mounted in the -opposite end-of inturned attachment flanges l which may be securedto bench l by wingedbolts '8;orother suitableattachment means; The sides 6 of base".

5 are provided with horizontal tracks" 9 in the per surface of the base.

A work-supporting table IO is mounted on the base or-bed 5 for travel over tracks 9 toward and away from sanding belt 4 and to this end table Iflhas depending end portions l which termi' nate ininturned retaining flanges I2- disposed beneath tracks 9 for preventing upward displacement of the table from its'base.

T nd" portions ll of the adjustable 1 table carry in wardly projeotingiwheels orrollers l3 which work on the upper surfaces of; tracks} and supf port the table."

Referring again to the base" or bed" 5; it a will be noted (see Fig. 4) that the downturned side portions 6 terminate at their outer or forward" ends in diminished arms l lhaving inclined up-. per edges and terminal portions l6 which are rigidly connected by a cross 'bar' [1, as best shown in Fig. 3. A backing plate or supporting back" 18 is hinged to the arms M by trunnions' i9 and rigidly carries at points somewhat above its phinged'edg e and at its two ends large-arcuate arms 20 which are slotted and adjustably secured or clamped to upstanding lugs or arms' ZI I which are attached to the extremities I6 of the 1 arms i4. 1 Supporting back or plate 18 detachably' carries: a belt-engaging board 22 constructed of I have found that a wooden board having a shellacked surfaceand coveredwithflaked'graphite is entirely .satisfactory for the purposes desired. The board or' non-abrasive material.

plate 22 is provided with grooves 23 in its ends for slidably receiving retaining flanges 24 formed on'the ends of back [8 (see Figs. 6 and 7);" The supporting back l8 at its upper edge is the: hook portions 26 of a hange'r 21 is slidably mounted. v Hanger 2'! includes an adjustable de-;

ries at its lower end a horizontally disposed work engaging ro1ler28 which is adapted to. press. g,y

providedwith a longitudinal flange 25 upon which piece of work 29 against the work table I 0. The

hook end of hanger 21 is provided with set screws which-are adapted toengage the inner edge of the work'a'nd to 'y'ieldingly hold the work against the sanding belt 4. A removable work abutment 36 isdetachably mounted upon the top of table HI and at one end thereof, as shown in-Fig. 2, for engagement with one end of a piece of. work to facilitate the positioning of the longitudinal edge of the work. Abutment fidmay be'suitably and detachably secured to table [0 by means of wing screws 31.

a Work hclding table H1 may be secured in adesired adjusted position by suitable means, .such asone or grnore set screws 38 (see Fig. 8) which threadedly engage the-side portions H of the table It and jamb against the longitudinal edges is i .Q

At the forward oroutward edge of the base or b ed,--l ongitudinallyextending supporting arms 39 are provided; (see Figs. 1 and i) these arms, as shown, lying -fiush. against the bench I and terminating-in bearings which may be suitably secured to the bench as byattachment elements 4 l. Bearings 46 havecut out central portions and have journaled therein shafts 43 which arcadjnstably secured against turning by set screws M. Spindles :4 5 extend perpendicularly to the shafts i3 and are rigidly secured thereto and-on each ofqsai d spindles-a belt guiding roller is rotatably mgunted, ball bearings being preferably provided. The lower run of the sanding belt is turned or twisted through approximately 90 deadjusting andsecuring the belt supporting back ported by the belt engaging board 22 and the grees and trained against the rollers 47. The lower run of the belt, as will be seen in Fig. 2, engages againstthe. outer sides of the rollers 41 and sba k d o supported bvt ard 22 a r db hesupp t a o p t peration- .pfi c cf work, such as the board 29 is posif tioned flatwise on work table lit with the edge to, be sanded extending parallel to the lower.

turned run 9f belt 4, Table i0 is then suitably adjusted by releasing set screws 38, shifting the table and then tightening the. screws. Roller 23 may then be-positioned against the work to hold the same against displacement by adjusting the clamping. bolt 3!. Roller 28 is preferably constructed of a somewhat compressible material,

suchas rubber, toprevent injury to the work. The spring work engaging fingers 35 are then adjusted by properly positioning and securing blockcarriage 32in its guide and yieldingly hold the longitudinal edge of the work against the sanding belt. The several edges of the work may 7 be successively sanded at any desired angle by structure atthe desired angle. Belt guide rollers arejthen also adjusted to a corresponding angle by manipulating the set screws 46. 'I 'he'belt in itstravelinginovement is correctly backed or sup smooth or shellacked surface of the board'provi'ded withalubr'icant, such as graphite which permits the; belt to slide smoothly over the face,

Block 32 has afiixed to the outer end thereof a series of. spring work-engaging fingers producing substantially perfect sanding of the edge of the work. When boards 22 become worn the same may be easily replaced.

Table I0 may be adjusted horizontally on the supporting base 55 in accordance with the different requisites, such as the variation in the angular adjustment of the supporting back is as well'as the width or other dimensions of the piece of work to be edged.

It will be noted that the arrangement and construction of the belt guiding rollers, supporting back and work supporting table enable boards or work varying substantially in length to be efflciently accommodated.

It will, of course, be understood that various changes may be made in the form, details, proportions and arrangement of the parts, Without 4 departing from the scope of my invention, which, generally stated, consists in a device capable of carrying out the objects above set forth and in the novel parts and combinations ;of parts disclosed and defined-in the appended claims.

What is claimed is;, V 1. Asanding machine having in combination,

a base, a belt supporting back mounted on said 2. Asanding machine having in combination;

a horizontal 'basehaving a worksupporting surface thereon, an upstanding, rigidback structure mountedfor, angular adjustment at one side of. said base and swingable on anaxis; disposed be-f low said work supportingsurface,- .means for V rigidly securing'said backstructure in an infinite number of adjusted positions. disposed at angles.

with reference to the plane of. said work supportingsurface, an endlesssanding .belt extend-- ing in general, longitudinallygof. said. back and.

base, means for guiding one, runof said sanding belt flush across said back structure. in slidable relation thereto, said means/being angularly adjustable to conform, to the adjustment of said back structure and means associatedwith said base and work supporting surface for engaging the inner edge of a piece of work to hold the same;

s di b t e en lin general, longitudinally.-

of said back and base, means for guiding onerun of said sanding belt fiushacrosssaid back structure longitudinally thereof and in slidable relation thereto, means associated with saidbase and work supporting table for engaging the inner. edge.

of a piece of work to holdthesame against. said sanding belt and adjustable means mounted on.

said back structure and depending from the upper portion .thereof for engaging'the upper sur-; face of apiece of work to-hold the sarne against said supporting table.

HARRY A-- GA Q I 

